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feat(library/tactic/class_instance_synth): restrict higher-order unification even more during type class resolution

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Leonardo de Moura 2015-03-03 20:26:49 -08:00
parent 7db6ed7c14
commit 51504a1872
1 changed files with 2 additions and 0 deletions
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2
src/library/tactic/class_instance_synth.cpp
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@ -349,6 +349,7 @@ constraint mk_class_instance_root_cnstr(std::shared_ptr<class_instance_context>
unifier_config new_cfg(cfg);
new_cfg.m_discard = false;
new_cfg.m_use_exceptions = false;
new_cfg.m_pattern = true;
new_cfg.m_conservative = C->m_conservative;
auto to_cnstrs_fn = [=](substitution const & subst, constraints const & cnstrs) -> constraints {
@ -461,6 +462,7 @@ optional<expr> mk_class_instance(environment const & env, io_state const & ios,
unifier_config new_cfg(cfg);
new_cfg.m_discard = true;
new_cfg.m_use_exceptions = true;
new_cfg.m_pattern = true;
new_cfg.m_conservative = C->m_conservative;
try {
auto p = unify(env, 1, &c, C->m_ngen.mk_child(), substitution(), new_cfg).pull();